Cam switch

The ornamental design for a cam switch, as shown and described.

FIG. 1 is a perspective view of a cam switch showing our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a left side elevational view thereof.

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of the cam switch is for the purpose of illustrating environmental structure and forms no part of the claimed design.

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